Run the add-in

After Excel launches, press the Show Taskpane button on the Home ribbon.

Select all the cells with numbers.

Press the Highlight button on the taskpane.

Questions and comments

We'd love to get your feedback about this sample. You can send your feedback to us in the Issues section of this repository.

Questions about Microsoft Office 365 development in general should be posted to Stack Overflow. If your question is about the Office JavaScript APIs, make sure that your questions are tagged with [office-js] and [API].